EP1606866B1

EP1606866B1 - Releasable barb assembly

Info

Publication number: EP1606866B1
Application number: EP04758533A
Authority: EP
Inventors: Jack E. Caveney; Steven M. Forster
Original assignee: Panduit Corp
Current assignee: Panduit Corp
Priority date: 2003-03-27
Filing date: 2004-03-26
Publication date: 2008-12-03
Anticipated expiration: 2024-03-26
Also published as: EP2026435A3; US7246778B2; US8474765B2; US20070274773A1; US7752730B2; EP1606866A1; DE602004018114D1; US7992279B2; WO2004088806A1; US20110268496A1; KR20050113253A; JP2006525781A; US20040218970A1; EP2026435B1; US20100232873A1; EP2026435A2; ATE416502T1; JP4719923B2

Abstract

The embodiments provide a barb assembly for use with a cable duct component to oppose removal of a cable duct section from the cable duct component. The barb assembly can comprise a releasable assembly for applying a force to a barb and, responsive to the application of the force, for moving the barb and one or more barb arms from an unengaged position to an engaged position without the use of tools. The barb assembly and/or cable duct component can also comprise a spring bias, which can bias the releasable assembly to the unengaged position upon actuating the releasable assembly to the unengaged position. The embodiments also provide methods of installing cable duct components and systems with the above-described features.

Description

RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application 60/458,139, filed March 27, 2003 ; U.S. Provisional Application 60/484,405, filed July 2, 2003 ; U.S. Provisional Application 60/484,429, filed July 2, 2003 ; and U.S. Provisional Application 60/493,656, filed August 8, 2003 .

BACKGROUND

1. Field of the Invention

The present invention relates to the field of duct-type cable routing systems. More specifically, the invention relates to fittings that allow quick assembly without the use of tools using a releasable barb assembly.

2. Background

Raceway duct systems have become very popular in recent years to route, protect, and conceal data, voice, video, fiber optic, and/or power cabling. Such systems allow custom installation and can be provided within walls or provided on external surfaces, allowing ready access for reconfiguration, repair, or installation of additional equipment. Such systems may typically include various sections of duct or raceway, including straight sections and various fittings, such as 90° elbow fittings, 45° elbow fittings, T-fittings, four-way intersection (x) fittings, and the like, respective ones of which are affixed together by duct couplers to cumulatively form a duct system.
U. S. Patent Nos. 6,634,605 , 6, 523,791 , 6,450,458 , and 6,559,378 provide examples and descriptions of the general background of cable duct couplers and other cable duct fittings, and the entirety of these applications are incorporated herein by reference as though set forth here in full. In particular US patent number 6,450,458 discloses a cable duct coupler having an inner wall with a support rib including at least one clip mount, an axially extending outer wall to define a duct section receiving space there between, and at least one removable retention clip. When cable duct sections are inserted into the duct section receiving space, the retention clip biases the duct section against the inner wall to retain them together. The retention clip further provides a retention force which resists undesired disassembly of the duct sections from the cable duct coupler. U. S. Patent No. 5,316, 243 (assigned to ADC Telecommunications, Inc. ) provides a description of the general background and environment of cable routing systems.
Due to the increase in the number and sophistication of such raceway duct systems, the number of duct couplers and fittings being installed in such systems has also increased significantly. Therefore, it is important to have couplers and fittings that are easy to install and inexpensive to manufacture, and that provide relatively high resistance to "pullout" forces to prevent unintended disassembly.
Previous designs disclosed a cable barb coupler comprising a barb that could be repeatedly moved between a first "engaged" position and a second "unengaged" position, without any material degradation in the performance of the coupler. However, the switch between the first and second modes required the use of tools to adjust the position of the barb. Although that previous design was an improvement over the prior art, it would be a further improvement to provide a product that offered the same advantages without requiring the use of additional tools. Significantly, the present invention permits the cable duct coupler to be selectively and repeatedly switched between a first "engaged" mode and a second "unengaged" mode without any degradation in performance of the coupler and without any need for or use of separate tools.
A cable duct system according to claim 1 and a method for assembling a cable duct system according to claim 8.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention are described herein with reference to the drawings, in which:

Figure 1 depicts an exploded view of a first embodiment of the lever actuated releasable barb assembly for use with a cable duct component;
Figure 2A is a cross-sectional view that depicts the lever actuated releasable barb assembly in an engaged position;
Figure 2B is a cross-sectional view that depicts the lever actuated releasable barb assembly in an engaged position with a channel or duct engaged by the barb;
Figure 2C is a cross-sectional view that depicts the lever actuated releasable barb assembly in the unengaged position with the channel or duct disengaged or removed;
Figure 3 depicts an alternate embodiment of a lever;
Figure 4 depicts a second embodiment of the lever actuated releasable barb assembly;
Figure 5 depicts a second embodiment of the lever actuated releasable barb assembly;
Figure 6 depicts an isometric view of a cable duct component comprising an alternate lever actuated releasable barb assembly;
Figure 7A depicts a side view of a portion of the embodiment of Figure 6 in the unengaged position;
Figure 7B depicts a side view of a portion of the embodiment of Figure 6 in the closed position;
Figure 8 depicts a side view of a detail of the embodiment of Figure 6;
Figure 9 depicts an isometric view of a first embodiment of the scotch yoke actuated releasable barb assembly for use with a cable duct component;
Figure 10 depicts an exploded view of the embodiment of Figure 9;
Figures 11A-11C depict side views of a bearing and a shaft from the embodiment of Figure 9;
Figures 12A and 12B depict side views of a portion of the barb assembly of Figure 9 in an engaged position;
Figures 13A and 13B depict side views of a portion of the barb assembly of Figure 9 in a partially unengaged position;
Figures 14A and 14B depict side views of a portion of the barb assembly of Figure 9 in an unengaged position;
Figures 15A-15C depict side views of a yoke comprising a detent from the embodiment of Figure 9;
Figure 16 depicts an isometric view of a second embodiment of the scotch yoke actuated releasable barb assembly;
Figures 17A-17C depict a radial path of a shaft as a bearing is rotated from the 0° position to the 180° position;
Figure 18 depicts an exploded view of an embodiment of the cam barrel actuated releasable barb assembly for use with a cable duct component;
Figure 18A depicts an alternate cam barrel for the releasable barb assembly of Figure 18;
Figure 19 depicts a side view of the releasable barb assembly of Figure 18 in an engaged position;
Figure 20 depicts a side view of the releasable barb assembly of Figure 18 in an engaged position and engaging a cable routing component;
Figure 21 depicts a side view of the releasable barb assembly of Figure 18 in an unengaged position;
Figure 22 depicts a side view of the releasable barb assembly of Figure 18 with a spring;
Figure 23 depicts an exploded view of an alternate embodiment of the cam barrel actuated releasable barb assembly; and
Figure 23A depicts alternate cam barrels of the releasable barb assembly of Figure 23.

DETAILED DESCRIPTION

The releasable barb assemblies described and claimed herein provide new and improved structures and techniques to connect and disconnect components in cable duct systems. The improved barb assemblies described and claimed herein can be mounted on a cable duct component, such as a coupler or fitting, and can selectively engage or unengage a duct, raceway, trough, or other fitting (collectively "duct sections") inserted into the cable duct component. In particular, embodiments of the barb assembly can provide a highly controllable and releasable downward force on a barb to cause the barb to engage a duct section of a cable routing system.
The improvement described and claimed herein involves the releasability of the barb from an engaged position to an unengaged position that is enabled by the use of a releasable assembly coupled to the barb. The releasable assembly brings about a number of advantages. It allows the channel or duct to be removed from the coupler without damaging the channel. As a result, a change can be made to the cable routing system without necessitating the use of new channels. Further, the removal of the channel can be accomplished without the need for any tools. This brings about a savings in labor costs.
Several examples of particular embodiments are provided below. It should be understood, however, that all the arrangements described herein are set forth for purposes of example only. As such, those skilled in the art will appreciate that other arrangements and other assemblies are contemplated as well.

1. Lever Actuated Releasable Barb Assembly Embodiment

This embodiment is directed to a lever actuated releasable barb assembly. The releasable barb assembly can be used advantageously as part of another component, such as a cable duct coupler, for example, to engage and disengage one or more components of cable routing systems.
Figures 1-5 depict embodiments of the lever actuated releasable barb assembly. Figure 1 depicts an exploded view of a first embodiment of the lever actuated releasable barb assembly 210 for use in a cable duct component, such as a coupler. The cable duct component is provided with a barb mount 224 that supports a barb 230 and has an internally threaded aperture 16 therein. The barb 230 includes a pair of barb arms 240 bent back relative to a barb body portion 212 at an angle greater than 90° so that the barb arms angle towards each other. The barb body 212 further includes at least one spring tab 236 that extends therefrom at an angle similar to that of the barb arms 240. The barb body 212 is mountable upon the barb mount 224. A lever mount 28 penetrates an opening 30 in the barb 230 and is connected to the barb mount 224, via an aperture 16, for example. The barb 230 may have serrated edges 36 at the distal ends of its barb arms 240.
The lever mount 28 can be provided with a hooked end 38 to enable it to function as a mount for a lever 40. The lever 40 includes a curved portion 42 at one end, the curved portion having a lever mount bearing surface 44 and a slot 46. To mate the lever 40 on the lever mount 28, the surface 44 of the lever 40 is inserted into the hooked end 38 of the lever mount 28. The lever 40 further includes an actuating tab or arm 222 that extends from the curved portion. The arm 222 is used to move the lever 40, and consequently the barb 230, between an engaged position and an unengaged position.
Figures 2A, 2B, and 2C are cross-sectional views that depict the releasable barb assembly 210 in use. In the embodiment of Figure 2A, the barb 230 is shown in the engaged position. The surface 44 of the lever 40 has been inserted into the hooked end 38 of the lever mount 28 and the arm 222 has been pushed in a direction toward the barb body 212. This action pushes the spring tabs 236 against a support shelf 238 on the cable duct component, the spring tabs 236 thereby being placed under tension.
Figure 2B shows the barb 230 in the engaged position with a channel or duct 54 engaged by the barb 230.
In the embodiment of Figure 2C, the barb 230 is shown in the unengaged position with the channel or duct 54 disengaged or removed. To release the channel 54, the lever 40 is pivoted about the lever mount 28, thereby moving the arm 222 of the lever 40 in a direction away the barb body 212. This action reduces the force being applied by the lever 40 against the barb body 212 and the spring tabs 236. The pivoting of the lever 40 releases the barb 230, thereby allowing the channel 54 to be disengaged or removed without being damaged by the serrated edges 36 of the barb 230.
To place the barb 230 back in the engaged position from the unengaged position, the lever 40 is again pivoted about the lever mount 28, moving the arm 222 of the lever 40 in a direction toward the barb body 212. Once pivoted, the lever 40 applies a force against the barb 230, thereby moving it toward the cable duct component wall 58. In addition, the spring tabs 236 are placed under tension.
Figures 2A, 2B, and 2C depict one embodiment of the lever 40. An alternate embodiment of the lever 60 is shown in Figure 3, the main difference being that the curved portion 62 of the lever is provided with a flat area 64. As the lever 60 is pivoted about the lever mount to move the barb 230 to the engaged position, the flat area 64 mates against the barb body 212. By being flat rather than rounded, this flat area 64 resists any accidental or inadvertent pivoting of the lever 60.
Figures 4 and 5 depict a second embodiment of the releasable barb assembly 210. The releasable barb assembly 210 of Figures 4 and 5 differs from that of Figures 1-3 in the type of coupling between the lever 140 and the lever mount 128. Again the lever mount 128 includes an externally threaded fastener that penetrates a hole 130 in the barb 230 and is directed into the internally threaded aperture 116 in the barb mount 224. A spring 165 is provided within the barb mount 224. As can best be seen from Figure 4, the lever mount 128 is also provided with a through-hole 166 extending therethrough.
The lever 140 is provided at one end with two curved members 168, each having a hole 170 extending therethrough and an actuating tab 172 extending from the curved members. To couple the lever 140 to the lever mount 128, a pin 174 is inserted through the hole 170 of one curved member 168, the through-hole 166 of the lever mount 128, and the hole 170 of the remaining curved member 168.
To move the barb 230 between the engaged position (shown in Figure 5) and the unengaged position, the lever 140 is pivoted about the lever mount 128. In the engaged position, the lever 140 acts against the barb 230, thereby compressing the spring 165 and moving the barb 230 toward the cable duct component wall 158. In the unengaged position, the lever 140 applies no force against the barb 230 and the spring 165 pushes against the barb 230. As a result, the barb 230 is released and the channel 154 may be removed without damage.

2. Alternate Lever Actuated Releasable Barb Assembly Embodiment

This embodiment is directed to an alternate lever actuated releasable barb assembly. The releasable barb assembly can be used advantageously as part of another component, such as a coupler or a cable duct reducer fitting, for example, to engage and disengage another component of a cable routing system.
Figures 6-8 depict an embodiment of the alternate lever actuated releasable barb assembly. As shown in the embodiment of Figure 6, an alternate lever actuated releasable barb assembly 210 can comprise a barb 230, a sidewall 244, and an arm 222. In one embodiment, the releasable barb assembly 210 can be a part of another component in a cable routing system, such as a reducer fitting 246.
Figures 7A and 7B depict a portion of the releasable barb assembly 210 of Figure 6. In the embodiments of Figures 7A and 7B, the barb 230 comprises a barb body portion 212 and a barb arm 240, which may be bent back relative to the barb body 212 at an angle greater than 90°. A portion of the barb body 212 can fixedly engage a cantilever portion 248 of a cable routing component, such as the reducer fitting 246. In addition, the arm 222 can be connected to a cam 220 and can facilitate the rotation of the cam 220. The cam 220, in turn, can comprise at least one pivot 215. Figures 7A and 7B further depict a component 234 of a cable routing system, which the releasable barb assembly 210 can engage.
In the embodiments of Figures 7A and 7B, the cam 220 is eccentric or offset from the center of the pivot 215, such that the cam 220 comprises a larger radial dimension 250 and a smaller radial dimension 252. Thus, as the cam 220 rotates around the pivot 215, the cam 220 can act on the barb body 212. For example, as the larger radial dimension 250 rotates toward or away from the barb body 212, the barb body 212 tends to move toward or away from, respectively, the component 234 and/or the barb assembly base 224.
In the embodiment of Figure 7A, the barb body 212 is tangential to the cam 220 at the approximate location of the smaller radial dimension 252. As the cam 220 rotates toward this position, the barb body 212 tends to move away from the barb assembly base 224 (and/or the component 234) and toward the unengaged position. In one embodiment, the cantilever portion 248 exerts a force on the barb body 212 that tends to move the barb body 212 away from the barb assembly base 224 (and/or the component 234) and toward the unengaged position. In the unengaged position, generally, the component 234 can be inserted or removed from the releasable barb assembly 210.
In the embodiment of Figure 7B, the barb body 212 is tangential to the cam 220 at the approximate location of the larger radial dimension 250. As the cam 220 rotates toward this position, the barb body 212 tends to move closer to the barb assembly base 224 (and/or the component 234) and toward the closed position. In one embodiment, the rotation of the larger radial dimension 250 of the cam 220 toward the closed position overcomes any force that the cantilever portion 248 exerts on the barb body 212. In the closed position, generally, the barb arm 240 resists the removal of component 234 from the releasable barb assembly 210.
In the embodiments of Figures 7A and 7B, the arm 222, the cam 220, and the pivot 215 can rotate between the closed and unengaged positions to cause or allow the barb body 212 to move closer to or further away from the barb assembly base 224 and/or the component 234. For example, if the arm 222 rotates in a first direction, the cam 220 can act on the barb body 212 to cause or allow the barb body 212 to move closer to the barb assembly base 224 and/or the component 234. And if the arm 222 rotates in a second direction, the cam 220 can act on the barb body 212 to cause or allow the barb body 212 to move further away from the barb assembly base 224 and/or the component 234. In one embodiment, the arm 222 can then be rotated to an unengaged position or an engaged position, and the releasable barb assembly 210 can then be locked in either position.
As the arm 222 rotates to the closed position, the barb arm 240 can bitingly engage the component 234. When a tensile "pullout" force is then applied to the component 234, the barb arm 240 (which might have a serrated edge, for example) may penetrate into the component 234 and/or oppose movement of the component 234. The barb 230 thus resists separation of the component 234 from the releasable barb assembly 210 or barb assembly base 224.
Figure 8 depicts a detail of the releasable barb assembly 210 of Figures 7A and 7B. As shown in the embodiment of Figure 8, the releasable barb assembly 210 can also comprise at least one pivot boss 254. The pivot boss 254 can, for example, be a part of the sidewall 244 of the releasable barb assembly 210. Further, the pivot boss 254 can engage each pivot 215 and, in one embodiment, can resist non-rotational movement of the pivot 215, while allowing the pivot 215, and hence the cam 220, to rotate between the unengaged and closed positions.

3. Scotch Yoke Actuated Releasable Barb Assembly Embodiment

This embodiment is directed to a scotch yoke actuated releasable barb assembly. The releasable barb assembly can be used advantageously as part of another component, such as a cable duct coupler, for example, to engage and disengage one or more components of cable routing systems.
Figures 9-17C depict embodiments of the scotch yoke actuated releasable barb assembly. As shown in the embodiment of Figure 9, a scotch yoke actuated releasable barb assembly 210 comprises a barb body portion 212, a yoke 214, a shaft 216, and bearings 221. In one embodiment, the releasable barb assembly 210 comprises one or more arms 222, and the arms 222 facilitate the rotation of the bearings 221. Figure 9 also depicts a barb 230 comprising the barb body 212 and one or more barb arms 240, which may be bent back relative to the barb body 212 at an angle greater than 90°.
As shown in the embodiment of Figure 10, the scotch yoke 214 comprises a slot 226 with a detent 231 and a rod 232. In one embodiment, the rod 232 is threaded and fixedly engages a cable duct component, such as a coupler (not shown) or a coupler base 224 (shown in Figures 12B, 13B, and 14B). Further, the bearing 221 can comprise an opening 228 that engages the shaft 216. In other embodiments, the bearings 221 are formed integrally with the shaft 216. Other examples are possible as well. In one embodiment, the slot 226 engages the shaft 216, such that the arms 222 and the bearings 221 can rotate and cause the slot 226 to act on the shaft 216.
Figures 11A-11C depict the bearing 221 and shaft 216 of Figure 10. In the embodiments of Figures 11A-11C, the shaft 216 can be eccentric or offset from the rotational center 235 of the bearing 221. In such a case, as the bearing 221 is rotated, the shaft 216 follows a radial path and moves in both the "x" and "y" directions relative to the rotational center 235. In one embodiment, as the shaft 216 moves in the y direction, the slot 226 of the yoke 214 acts on the shaft 216 to cause the barb body 212 to move in the y direction.
Figures 11A-11C depict a radial path of the shaft 216 as the bearing 221 is rotated from the 0° position to the 180° position. Figure 11A depicts the bearing 221 at the 0° position and the shaft 216 at the x = 0, y = R position relative to the rotational center 235 of the bearing 221. As depicted in the embodiment of Figure 11B, the bearing 221 can rotate to the 90° position and can cause the shaft 216 to rotate to the x = R, y = 0 position. And as shown in the embodiment of Figure 11C, the bearing 221 can rotate to the 180° position and can cause the shaft 216 to rotate to the x = 0, y = -R position.
Figures 12A and 12B depict the releasable barb assembly 210 in an engaged position. As depicted in the embodiments of Figures 12A and 12B, in the closed position, the shaft 216 is located at, approximately, the x = 0, y = R position ("the (0, R) position") relative to the rotational center 235 of the bearing 221. In one embodiment, the (0, R) position results in the barb body 212 being a distance of y₁ from the coupler base 224.
Figures 13A and 13B depict the releasable barb assembly 210 in a partially unengaged position. As depicted in the embodiments of Figures 13A and 13B, in the partially unengaged position, the shaft 216 may be located at, approximately, the x > 0, - R < y < R position relative to the rotational center 235 of the bearing 221. In one embodiment, the x > 0, -R < y < R position results in the barb body 212 being a distance of y₂ from the coupler base 224.
Figures 14A and 14B depict the releasable barb assembly 210 in an unengaged position. As depicted in the embodiments of Figures 14A and 14B, in the unengaged position, the shaft 216 is located at, approximately, the x = 0, y = -R position ("the (0, -R) position") relative to the rotational center 235 of the bearing 221. In one embodiment, the (0, -R) position may result in the barb body 212 being a distance of y₃ from the coupler base 224.
In the embodiments of Figures 12A-14B, y₃ > y₂ > y₁, and the arm 222, bearing 221, and shaft 216 can rotate between the closed, partially unengaged, and unengaged positions to cause or allow the barb body 212 to move closer to or further away from the coupler base 224. For example, if the arm 222 rotates in a first direction, the slot 226 of the yoke 214 may act on the shaft 216 to cause or allow the barb body 212 to move closer to the coupler base 224. And if the arm 222 rotates in a second direction, the slot 226 may act on the shaft 216 to cause or allow the barb body 212 to move further away from the coupler base 224. The arm 222 might then rotate to an unengaged position or an engaged position, and the releasable barb assembly 210 might then be locked in either position.
In the closed position, the barb arm 240 can bitingly engage a component of a cable routing system as the arms 222 rotate to the closed position. When a tensile "pullout" force is then applied to the component of the cable routing system, the barb arm 240 (which might have a serrated edge, for example) may penetrate into the component and/or oppose movement of the component. The barb 230 thus resists separation of the component from the coupler or coupler base 224.
Figures 15A-15C depict yoke 214 comprising a slot 226 with a detent 231 that can engage a shaft 216. In one embodiment, as the shaft 216 moves in the x direction, the detent 231 engages the shaft 216 as the shaft 216 nears the x = 0 location in the closed and/or unengaged positions. By engaging the shaft 216, the detent 231 may then resist movement of the shaft 216. In one embodiment, the barb arms 240 of the barb 230 provide a force (depicted as an arrow in Figures 15A-15C) that acts generally in the y direction on the shaft 216 to tend to cause the detent 231 to engage the shaft 216.
Figure 16 depicts an alternate embodiment of the releasable barb assembly 210. In the embodiment of Figure 16, the releasable barb assembly 210 comprises a barb body portion 212, a bearing block 245, an eccentric bearing 221, and one or more yokes 214. In one embodiment, the releasable barb assembly 210 comprises one or more arms 222 and or one or more shafts 216. The arms 222 can then facilitate the rotation of the shafts 216 and the eccentric bearing 221. Figure 16 also depicts a barb 230 comprising the barb body 212 and one or more barb arms 240, which may be bent back relative to the barb body 212 at an angle greater than 90°.
Figures 17A-17C depict a radial path of a shaft 216 as the bearing 221 is rotated from the 0° position to the 180° position. Figure 17A depicts the releasable barb assembly 210 in an engaged position. As depicted in the embodiment of Figure 17A, in the closed position, the shaft 216 is located at, approximately, the x = 0, y = -R position ("the (0, -R) position") relative to the rotational center 235 of the bearing 221. In one embodiment, the (0, -R) position may result in the barb body 212 being a distance of y₁ from the coupler base 224.
Figure 17B depicts the releasable barb assembly 210 in a partially unengaged position. As depicted in the embodiment of Figure 17B, in the partially unengaged position, the shaft 216 is located at, approximately, the x < 0, -R < y < R position relative to the rotational center 235 of the bearing 221. In one embodiment, the x < 0, -R < y < R position results in the barb body 212 being a distance of y₂ from the coupler base 224.
Figure 17C depicts the releasable barb assembly 210 in an unengaged position. As depicted in the embodiment of Figure 17C, in the unengaged position, the shaft 216 may be located at, approximately, the x = 0, y = R position ("the (0, R) position") relative to the rotational center 235 of the bearing 221. In one embodiment, the (0, R) position results in the barb body 212 being a distance of y₃ from the coupler base 224.
In the embodiments of Figures 17A-17C, y₃ > y₂ > y₁, and the arm 222, bearing 221, and shaft 216 can rotate between the closed, partially unengaged, and unengaged positions to cause or allow the barb body 212 to move closer to or further away from the coupler base 224. For example, if the arm 222 rotates in a first direction, the shaft 216 may act on the eccentric bearing 221 to cause or allow the barb body 212 to move closer to the coupler base 224. And if the arm 222 rotates in a second direction, the shaft 216 may act on the eccentric bearing 221 to cause or allow the barb body 212 to move further away from the coupler base 224. The arm 222 might then rotate to an unengaged position or an engaged position, and the releasable barb assembly 210 might then be locked in either position.
As in the other embodiments, in the closed position, the barb arm 240 can bitingly engage a component of a cable routing system as the arms 222 rotate to the closed position. When a tensile "pullout" force is then applied to the component of the cable routing system, the barb arm 240 (which might have a serrated edge, for example) may penetrate into the component and/or can oppose movement of the component. The barb 230 thus resists separation of the component from the coupler or coupler base 224.

4. Cam Barrel Actuated Releasable Barb Assembly Embodiment

This embodiment is directed to a cam barrel actuated releasable barb assembly. The releasable barb assembly can be used advantageously as part of another component, such as a cable duct coupler, for example, to engage and disengage one or more components of cable routing systems.
Figures 18-23A depict embodiments of the cam barrel actuated releasable barb assembly. Turning to the embodiment of Figure 18, a cam barrel actuated releasable barb assembly 210 can comprise a barb body portion 212 with one or more tabs or cam followers 219, a cam barrel 217 with one or more cam tracks 218, and a cable duct component base 224. In one embodiment, the tabs or cam followers 219 can engage the cam tracks 218, such that the cam barrel 217 can rotate and cause the cam tracks 218 to act on the tabs 219 of the barb body 212. As the cam barrel 217 rotates, the cam tracks 218 might then cause or allow the barb body 212 to move closer to or further away from the component base 224. For example, if the cam barrel 217 rotates in a first direction, the cam tracks 218 might cause or allow the barb body 212 to move closer to the component base 224. And if the cam barrel 217 rotates in a second direction, the cam tracks 218 might cause or allow the barb body 212 to move further away from the component base 224. The cam barrel 217 might then rotate to an unengaged position or an engaged position, and the releasable barb assembly 210 might then be locked in either position.
In one embodiment, the cam barrel 217 might comprise one or more arms or levers 222, and the arms or levers 222 might facilitate the rotation of the cam barrel 217. Further, in one embodiment, the cam barrel 217 might comprise one or more locking pin recesses 223, and the component base might comprise one or more locking pins 227. The locking pin recesses 223 might act on the locking pins 227 to restrict the range of rotation (shown in Figure 18 as dashed lines 233) of the cam barrel 217. Other examples are possible, such as the cam barrel 217 comprising one or more locking pins and/or the component base 224 comprising one or more recesses.
Figure 18A depicts an alternate embodiment of cam barrel 217 comprising alternate cam tracks 218. In the embodiment of Figure 18A, the cam tracks 218 comprise a channel or groove that can engage the tabs or cam followers 219.
Figure 19 depicts the releasable barb assembly 210 in an engaged position and not engaging a cable routing component 234. Figure 19 also depicts a barb 230 comprising the barb body 212 and one or more barb arms 240, which might be bent back relative to the barb body 212 at an angle greater than 90°. In one embodiment, the barb 230 might comprise one or more spring tabs 236, which, in turn, might act on a support component 238, such as a support shelf on a cable duct component. The spring tabs 236 might then tend to cause the barb body 212 and/or the barb 230 to move away from the component base 224 as the cam barrel 217 rotates to the unengaged position.
Figure 20 depicts the releasable barb assembly 210 in an engaged position and engaging the component 234. As depicted in the embodiment of Figure 20, the barb arm 240 can bitingly engage the component 234 as the cam barrel 217 rotates to the closed position. When a tensile "pullout" force is then applied to the component 234, the barb arm 240 (which might have a serrated edge, for example) might penetrate into the component 234 and/or can oppose movement of the component 234. The barb 230 can thus resist separation of the component 234 from the cable duct component or component base 224.
Figure 21 depicts the releasable barb assembly 210 in an unengaged position and not engaging the component 234. As depicted in the embodiment of Figure 21, the spring tabs 236 can act on the support component 238 to tend to cause the barb body 212 and/or the barb 230 to move away from the component base 224. In such a way, the barb arm 240 and in turn the releasable barb assembly 210 can disengage the component 234 as the cam barrel 217 rotates to the unengaged position.
In the embodiment of Figure 22, the releasable barb assembly 210 comprises a spring 242. In one embodiment, the spring 242 can act on the barb body 212 to tend to cause the barb body 212 and/or the barb 230 to move away from the component base 224. In such a way, the barb arm 240 and in turn the releasable barb assembly 210 might disengage the component 234 as the cam barrel rotates to the unengaged position. In one embodiment, spring 242 might be a coaxial compression spring, but other examples are possible as well.
Figure 23 shows another embodiment of the releasable barb assembly 210. In the embodiment of Figure 23, the barb body 212 can comprise cam tracks 218 and the cam barrel 217 can comprise tabs or cam followers 219. The tabs or cam followers 219 can then engage the cam tracks 218, such that the cam barrel 217 can rotate and cause the tabs 219 to act on the cam tracks218. As in other embodiments, the cam barrel 217 might then rotate to an unengaged position or an engaged position, and the releasable barb assembly 210 might then be locked in either position.
Figure 23A depicts alternate embodiments of cam barrel 217 comprising alternate tabs or cam followers 219.

Claims

A cable duct system, comprising:
a first cable duct section (154) and a second cable duct section (154), each cable duct section (154) comprising an end;

a cable duct coupler (210) for coupling the first and second cable duct sections (154), wherein the cable duct coupler (210) can receive the end of the first and second cable duct sections (154), the cable duct coupler (210) further comprising a barb (230) for engaging the first and second cable duct sections (154) and a releasable assembly for applying a force to the barb (230) and, responsive to the application of the force, engaging at least one of the first and second cable duct sections (154) with the barb (230); characterised in that said assembly for applying a force to the barb (230) is releasable without the use of tools.
The cable duct system of claim 1 wherein the barb (230) comprises a body (212) and one or more barb arms (240) extending from the body (212) to bitingly engage an end of at least one of the first and second cable duct sections and to oppose removal of a cable duct section from the cable duct coupler; and
wherein, responsive to the application of the force by the releasable assembly (210) to the barb (230), the barb (230) and one or more barb arms (240) are movable from an unengaged position to an engaged position without the use of tools.
The cable duct system of claim 1 or claim 2 wherein the cable duct coupler comprises a U-shape.
The cable duct system of claim 1 or claim 2 wherein actuating the releasable assembly (210) to an engaged position causes an end of at least one of the barb arms (240) to bitingly engage at least one of the first and second cable duct section.
The cable duct system of claim 1 or claim 2 wherein the releasable assembly (210) is in the engaged position and at least one of the barb arms (240) is bitingly engaging a cable duct section.
The cable duct system of claim 1 or claim 2 wherein the barb assembly further comprises a spring bias (165) that biases the releasable assembly (210) to the unengaged position upon actuating the releasable assembly to the unengaged position.
The cable duct system of claim 1 wherein the cable duct coupler comprises a mount (224) for receiving and holding the barb (230).
A method for assembling a cable duct system, the method comprising:
providing first and second cable duct sections, each cable duct section comprising an end;

providing a cable duct coupler for coupling the first and second cable duct sections, wherein the cable duct coupler can receive the ends of the first and second cable duct sections, the cable duct coupler further comprising a barb (230) for engaging the first and second cable duct sections;

inserting the ends of the first and second cable duct sections into the cable duct coupler; applying a force to the barb (230) and, responsive to the application of the force, engaging the at least one of the first and second cable duct sections with the barb (230); and
characterised in that the force is applied to the barb (230) by actuating a releasable assembly (210) without the use of tools.
The method of claim 8 wherein the cable duct coupler comprises a U-shape.
A method as claimed in claim 8 in which the cable duct coupler comprises a barb assembly comprising:
a barb (230) comprising a body (212) and one or more barb arms (240) extending from the body (212) to bitingly engage at least one of the first and second cable duct sections and to oppose removal of a cable duct sections from the cable duct coupler; and

a releasable assembly (210) for applying a force to the barb (230) and, responsive to the application of the force, for moving the barb (230) and one or more barb arms (240) from an unengaged position to an engaged position without the use of tools.
The method of claim 10 further comprising biasing the releasable assembly (210) to the unengaged position upon actuating the releasable assembly (210) to the unengaged position.
The method of claim 10, wherein the cable duct comprises a mount (224) for receiving and holding the barb (230)
The cable duct system or method of claim 1 or claim 10 respectively wherein the releasable assembly (210) comprises a scotch yoke assembly and preferably wherein the scotch yoke assembly further comprises:
a yoke (214) connected to the cable duct coupler, the yoke (214) comprising a slot (226) adapted to receive a shaft (216) and to act on the shaft (216);

one or more bearings (221) eccentrically connected to the shaft (216), the bearings (221) adapted to rotate and act on the barb (230); and one or more arms (222), each concentrically connected to one of the bearings (221) and each adapted to rotate and preferably wherein rotation of the one or more arms (222) causes the slot (226) to act on the shaft (216) and the bearing (221) to act on the barb (230) to apply a force to the barb (230) and, responsive to the application of the force, to move the barb (230) and one or more barb arms (222) from an unengaged position to an engaged position without the use of tools.
The cable duct system or method of claim 13 wherein actuation of the scotch yoke assembly (210) actuates the releasable assembly between the unengaged position and the engaged position without the use of tools.
The cable duct system or method of claim 13 wherein actuation of the scotch yoke assembly (210) causes the releasable assembly to apply a force to the barb (230) and, responsive to the application of the force, to move the barb (230) and one or more barb arms (240) from an unengaged position to an engaged position without the use of tools.
The cable duct system or method of claim 1 or 10 respectively wherein the releasable assembly (210) comprises a cam barrel assembly and preferably wherein the cam barrel assembly further comprises:
a cam barrel (217) rotatably connected to the cable duct coupler, the cam barrel (217) comprising a cammed slot adapted to receive a portion of the barb body (212) and adapted to act on the barb (230) and preferably further comprising one or more arms extending from the cam barrel (217).
The cable duct system or method of claim 1 or 10 respectively wherein rotation of the cam barrel (217) causes the cammed slot to act on the barb (230) to apply a force to the barb (230) and, responsive to the application of the force, to move the barb (230) and one or more barb arms (240) from an unengaged position to an engaged position without the use of tools.
The cable duct system or method of claim 17 wherein actuation of the cam barrel (217) actuates the releasable assembly between the unengaged position and the engaged position without the use of tools.
The cable duct system or method of claim 17 wherein actuation of the cam barrel (217) causes the releasable assembly to apply a force to the barb (230) and, responsive to the application of the force, to move the barb (230) and one or more barb arms (240) from an unengaged position to an engaged position without the use of tools.
The cable duct system or method of claim 1 or claim 10 respectively wherein the releasable assembly (210) comprises a lever assembly and preferably wherein the lever assembly further comprises:
a lever (40) and a lever mount (28), the lever comprising a lever mount bearing surface (44) and a barb bearing surface, the lever mount bearing surface adapted to act on the lever mount (28) and the barb bearing surface adapted to act on the barb (230) and preferably wherein actuation of the lever (40) causes the lever mount bearing surface (44) to act on the lever mount (28) and causes the barb bearing surface to act on the barb (230) to apply a force to the barb (230) and, responsive to the application of the force, to move the barb (230) and one or more barb arms (240) from an unengaged position to an engaged position without the use of tools.
The cable duct system or method of claim 20 wherein actuation of the lever (40) actuates the releasable assembly (210) between the unengaged position and the engaged position without the use of tools or wherein actuation of the lever (40) causes the releasable assembly (210) to apply a force to the barb (230) and, responsive to the application of the force, to move the barb (230) and one or more barb arms (240) from an unengaged position to an engaged position without the use of tools.